eli5: Why was E=mc2 so revolutionary?
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It wasn’t really. Special relativity tied up a bunch of mysteries surrounding the movement of light, the nature of mass and energy, and the relationship between time and space. Einstein never actually wrote E=mc^2 , that’s something that someone else came along and worked out from Einstein’s equations. You could argue that it’s revolutionary for being such a simple equation with powerful consecuences, but there’s so much more happening inside Special relativity that Einstein later had to develop General relativity to nail down all the details.
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